@abc
@@def
nil?
my_var
$global
String
1234
0765
0xABD3
0b10101100
# here comes a comment
1_2_3_4
07_6_5
0xAB_D3
0b101_011_00
nil? sort! Array$ my_var=
@var # this is a variable
@3 0d 356_23_ 0b_ 0B011001011234